<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="item in cartList" :key="item.id">
          <li class="cart-list-con1">

            <!-- 单击事件获取  表单的事件对象 -->
            <input type="checkbox" name="chk_list" :checked="item.isChecked == 1" @click="changeShopCartCheckFn(item.skuId, $event)" />
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" />
            <div class="item-msg">{{ item.skuName }}</div>
          </li>

          <li class="cart-list-con4">
            <span class="price">{{ item.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeGoodNum('sub', -1, item)">-</a>
            <input autocomplete="off" type="text" :value="item.skuNum" @change="changeGoodNum('change', $event.target.value * 1, item)" minnum="1" class="itxt" />
            <a href="javascript:void(0)" class="plus" @click="changeGoodNum('add', 1, item)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.skuNum * item.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteGoodInfo(item.skuId)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked" @click="changeAllCheck($event)"/>
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheck">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择 <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ AllPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn"   @click="gotoTrade">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { deleteShopCartInfo, shopCartChecked } from '@/api/index.js'
export default {
  name: 'ShopCart',
  mounted() {
    this.getData()
  },
  methods: {
    //跳转到结算订单页面
    gotoTrade(){
      this.$router.push('/trade')
    },
    // 实现全部选中,全部取消选中
    changeAllCheck(event){
      let PromiseAll = []
      let checkNum = event.target.checked?1:0
      this.cartList.forEach(item=>{
        if(item.isChecked != checkNum){
       let result = shopCartChecked(item.skuId,checkNum)
       PromiseAll.push(result)
       }
      })
      Promise.all(PromiseAll).then(res=>{
        this.getData()
      }).catch(err=>{
        alert('响应失败')
      })
    },
    // 删除全部选中商品
    deleteAllCheck(){
      let PromiseALl = []
      this.cartList.forEach(item=>{
        if(item.isChecked == 1){
        let result =  deleteShopCartInfo(item.skuId)
        
        PromiseALl.push(result)
        }
      })
      Promise.all(PromiseALl).then(res=>{
        this.getData()
      }).catch(err=>{
        alert('删除失败')
      })
    },
    changeShopCartCheckFn(id, event) {
      // event.target.checked 可以获取到 当前表单的选中状态
      let checkNum = event.target.checked ? 1 : 0
      //发送请求修改数据
     shopCartChecked(id,checkNum).then(res=>{
         //请求成功进行数据回显
        this.getData()
      }).catch(res=>{
        //请求失败提示用户
        alert('服务器响应失败')
      })
    },
    deleteGoodInfo(id) {
      // 发送请求删除数据
      deleteShopCartInfo(id)
        .then((res) => {
          //  删除数据成功后进行回显
          this.getData()
        })
        .catch((err) => {
          alert('删除数据失败')
        })
    },
    getData() {
      this.$store.dispatch('getShopCartList')
    },
    changeGoodNum(type, disnum, good) {
      if (type == 'add') {
        this.$store.dispatch('addToCartOfUpdate', { skuId: good.skuId, skuNum: disnum }).then((res) => {
          this.getData()
        })
      } else if (type == 'sub') {
        if (good.skuNum > 1) {
          // 提交购物车数据修改数据库的数量
          this.$store.dispatch('addToCartOfUpdate', { skuId: good.skuId, skuNum: disnum }).then((res) => {
            //做数据回显，一定要在请求的 then 里面执行，否则可能出现还没有更改购物车数量，就已经执行数据回显了
            this.getData()
          })
        } else {
          this.$store.dispatch('addToCartOfUpdate', { skuId: good.skuId, skuNum: 0 }).then((res) => {
            this.getData()
          })
        }
      } else {
        if (isNaN(disnum) || disnum < 0) {
          this.$store.dispatch('addToCartOfUpdate', { skuId: good.skuId, skuNum: 0 }).then((res) => {
            this.getData()
          })
        } else {
          let num = parseInt(disnum) - good.skuNum
          this.$store.dispatch('addToCartOfUpdate', { skuId: good.skuId, skuNum: num }).then((res) => {
            this.getData()
          })
        }
      }
    },
  },
  computed: {
    cartList() {
      return this.$store.getters.cartList.cartInfoList
    },
    AllPrice() {
      let sum = 0
      // 利用forEach求商品总价
      // cartList 要遍历的数组， item 为 数组中的每一项
      this.cartList.forEach((item) => {
        if(item.isChecked == 1){
          //  sum为价格总和 = sum + 商品价格 * 商品数量
        sum = sum + item.skuPrice * item.skuNum
        }
        
      })

      return sum
    },
    isAllChecked() {
      // 是否全选 ， every监测 数组cartList中的isChecked是否为1，只有所有数组项的isChecked为 1 ， every函数的返回值才为1
      let result = this.cartList.every((item) => {
        return item.isChecked == 1
      })

      return result
    },
  },
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
